Vintage Unisa Flat Sandals with Lace Ties

GUC. Reposh as these were just a tad too small for me. Shoe material feels like leather. There are dark "rub" marks on the area above toes, think it's from storage-but I have had these on my closet floor since I bought them. The inside of heel backing is showing signs of being worn, but structure is intact throughout (see last two pics). Bottom of shoes state "8M", which I normally wear, but these seem to be made for a slimmer fit. Pet friendly home but kept in spare room tub. Wood background is dining table, not the floor.